Wellness peptide craze: why people are injecting drugs 'not for human consumption' GHK Cu is not Botox. It does not freeze a single muscle. It works because it works at the matrix level. GHK Cu stimulates collagen and glycosaminoglycan synthesis, modulates the matrix metalloproteinases that govern GHK Cu is a naturally occurring copper binding peptide that plays a major role in tissue repair and remodeling, with a strong focus in research on skin and hair biology. It works by signaling GHK Cu Peptide: Benefits for Tissue Repair, Healing, and Recovery Revolution Health & Wellness